Mohd. Ali, H., S. N. Abdul Halim, S. P, S. M. Zain, and E. Ismail. “Synthesis and Biological Activities of Nickel(II) and Cadmium(II) Complexes of Chlorohydroxyacetophenone-Nitrobenzoylhydrazone: Mechanism for Formation of the Nickel(II) Complex”. Malaysian Journal of Science, vol. 25, no. 1, Apr. 2006, pp. 99-105, https://ajap.um.edu.my/index.php/MJS/article/view/8276.